softsusy

SOFTSUSY - supersymmetric/Higgs spectrum and decays

by: B C Allanach, P Athron, A Bednyakov, M Bernhardt, T Cridge, D Grellscheid, M Hanussek, C H Kom, S Martin, D Robertson, R Ruiz de Austri, P Slavich, L Tunstall, A Voigt and A G Williams

Summary

This program provides a SUSY spectrum in the NMSSM, or the MSSM including flavour violation and with or without R-parity consistent with input Standard Model fermion mass/mixings and electroweak/strong coupling data. The R-parity violating mode can calculate neutrino masses and mixings to 1 loop. SOFTSUSY can be used in conjunction with other programs for many different particle physics calculations. SOFTSUSY now has a mode with 3 loop RGEs and some 2-loop threshold correction and 2-loop SUSY QCD corrections to gluino and squark pole masses. SOFTSUSY now computes decay branching ratios for the MSSM and NMSSM. It also ships with (and links to) Himalaya-1.0 for three-loop corrections to mh0.

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• SOFTSUSY-4.1.20 (23/8/23): Fixed SLHA output which was giving the wrong RPV inputs. SOFTSUSY-specific SLHA input options given automatically printed out now in SLHA output. Fixed dm^2(atm) in neutrino output for RPV mode. Also, corrected RPV pMSSM SLHA output, adding rpvPmssmInput to repository.
• SOFTSUSY-4.1.19 (16/8/23): improved 2/3 body neutralino/chargino decays. Previously, there were occasionally numerical problems yielding junk for a (very heavy) RH sneutrino contribution. The RH sneutrino parts have now been explicitly decoupled. Thanks to S Kraml and T Pascal for reporting the bug.
• SOFTSUSY-4.1.18 (25/7/23): improved 2/3 body neutralino decays. Occasionally, SOFTSUSY would find neutralino2 to be stable when in fact it really had 3 body decays. This occured when the decay of the running mass of the Z would allow 2 body decays but not the pole mass. Thanks to S Kraml and T Pascal for reporting the bug.
• SOFTSUSY-4.1.17 (2/2/23): improved documentation for github

Previous releases (4.1.13 and before) can be obtained from the old website

Quick Installation and Run Test

See INSTALL.md for quick installation and run-test instructions.

For other ultra-basic instructions, see the introduction video. Otherwise, see a quick tutorial given at BUSSTEPP 2012.

Note that the executables are actually wrapper scripts, the “true” executables lie in the directory .libs/.

References/manuals

If you use SOFTSUSY to write a paper, please cite (see MCnet guidelines) - collected in soft.bib the manuals (up-to-date manuals included with distribution in doc subdirectory):

1. rpcManual.pdf is the main one for the R-parity conserving MSSM: the base for all others: B.C. Allanach, Comput. Phys. Commun. 143 (2002) 305-331, hep-ph/0104145
2. decays.pdf details calculations of sparticle and Higgs decays in the MSSM/NMSSM: B.C. Allanach and T. Cridge, Comput. Phys. Comm. 220 (2017) 417, arxiv:1703.09717
3. nmssmManual.pdf describes the NMSSM implementation: B.C. Allanach, P. Athron, L. Tunstall, A. Voigt and A. Williams, Comput. Phys. Comm. 185 (2014) 2322, arXiv:1311.7659
4. rpvManual.pdf for R-parity violating generalisation: B.C. Allanach and M.A. Bernhardt, Comput. Phys. Commun. 181 (2010) 232, arXiv:0903.1805
5. neutManual.pdf on the one-loop calculation of neutrino masses and lepton mixing in the R-parity violating MSSM: B.C. Allanach, M. Hanussek and C.H. Kom, Comput. Phys. Commun. 183 (2012) 785, arXiv:1109.3735
6. threeLoop.pdf describes the inclusion of three-loop MSSM RGEs and two-loop threshold corrections: B.C. Allanach, A. Bednyakov and R. Ruiz de Autri, Comput. Phys. Commun. 189 (2015) 192, arXiv:1407.6130
7. ho.pdf describes the inclusion of two-loop SUSYQCD corrections to squark and gluino pole masses: B.C. Allanach, Stephen P. Martin, David G. Robertson and Roberto Ruiz de Austri, Comput. Phys. Commun. 05 (2017) 006, arXiv:1601.06657

Particle Decays

An example point including the calculation of sparticle decays, neglecting modes with a branching ratio of less than 1.0e-5, and outputting the partial widths in the comments:

./softpoint.x gmsb --n5=2 --mMess=1.0e6 --LAMBDA=5.0e5 --tanBeta=10 --sgnMu=1 --decays --minBR=1.0e-5 --outputPartialWidths

For queries regarding decay calculations please contact Tom Cridge

Three Loop Corrections to the Lightest CP Even Higgs Mass

For Himalaya-1.0 three-loop corrections to mh0, you must first install the package Eigen. Then do:

./configure CPPFLAGS="-I/usr/include/eigen3" --enable-two-loop-gauge-yukawa-compilation --enable-himalaya; make

After this, setting the SLHA SOFTSUSY BLock parameter 7 (number of Higgs mass loops) to 3 will include the corrections. If you use this option, you should cite [1], [6] and

• Robert V. Harlander, Jonas Klappert, Alexander Voigt, Eur. Phys. J. C77 (2017) 814, arXiv:1708.05720
• P Kant, R Harlander, L Mihaila, M Steinhauser, JHEP 1008 (2010) 104, arXiv:1005.5709

SOFTSUSY-specific input for SUSY Les Houches Accord input files

Block SOFTSUSY           # SOFTSUSY specific inputs
  1   <TOLERANCE>        # desired fractional accuracy in output
  2   <MIXING>           # quark mixing option
  3   <PRINTOUT>         # gives additional verbose output during calculation
  4   <QEWSB>            # change electroweak symmetry breaking scale
  5   <INCLUDE_2_LOOP_SCALAR_CORRECTIONS>    # Full 2-loop running in RGEs
  6   <PRECISION>        # number of significant figures in SLHA output
  7   <numHiggsLoops>    # number of loops in REWSB/mh calculation
  8   <susyRpvBCatMSUSY> # Switch MSUSY-scale RPV boundary conditions ON
  9   <invertedOutput>   # RPV neutrino output uses normal hierarchy (=0.0) or inverted (=1.0)
 10   <forceSlha1>       # if =1, tries to force output into SLHA *1* format
 11   <m32>              # sets gravitino mass to m32
 12   <printSpectra>     # Prints spectrum even when point is theoretically excluded if=1
 13   <mAFlag>           # If=0 (default), sets tachyonic mA=0, otherwise mA=sqrt(|mA|^2)
 15   <NMSSMTools>       # If=1, enables NMSSMTools compatible SLHA2 output
 16   <MICROMEGAS>       # Micromegas options for NMSSMTools use: 1=RD, 2=DD, 3=ID, 4=both
 17   <NMSDECAY>         # If=1, flags for sparticle decays to be calculated via NMSDECAY
 18   <SoftHiggsOut>     # If=1, then the EWSB conditions output soft Higgs masses in NMSSM
 19   <threeLoopRGEs>    # If=1, then 3-loop MSSM RGEs included (default of 0 to disable)
 20   <gyThresholds>     # If>0, switch on gauge/Yukawa two-loop thresholds (see manual [6] for details). If=31, they all are switched on (default 0 to disable).
 22   <2-loop squark/gluino>   # Include 2-loop terms in gluino/squark masses (default of 0 to disable)
 23   <expandAroundGluinoPole> # sets expandAroundGluinoPole parameter (default 3)
 24   <minBR>                  # If decay BR is below this number, don't output that mode
 25   <threeBodyDecays>        # If set to 0, don't calculate 3-body decays (1=default)
 26   <outputPartialWidths>    # If set to 1, output partial widths (0=default)
 27   <MQEDxQCD>    # Set scale at which QEDxQCD is matched to MSSM (mt=default)

High orders mode

If the 2-loop SUSY QCD corrections to squark and gluino masses are required, do

./configure --enable-two-loop-sparticle-mass-compilation
make 

An example point using the higher order terms can be run with, for example,

./softpoint.x sugra --tol=1.0e-4 --m0=1000 --m12=1000 --a0=0 --tanBeta=10 --sgnMu=1 --two-loop-sparticle-masses --two-loop-sparticle-mass-method=1

High accuracy mode

If the high accuracy mode with 3-loop RGEs and some 2-loop threshold corrections is required, do

./configure --enable-full-susy-threshold-compilation --enable-three-loop-rge-compilation
make 

An example point using the high accuracy mode can be run with, for example,

./softpoint.x sugra --tol=1.0e-5 --m0=7240 --m12=800 --a0=-6000 --tanBeta=50 --sgnMu=1 --mt=173.2 --alpha_s=0.1187 --mbmb=4.18 --two-loop-susy-thresholds --three-loop-rges

See [6] for more details.

Executable files: after installation

• softsusy.x: example C++ test program - calculates spectrum of SPS1a mSUGRA point with varying tan beta. Main program: src/main.cpp. Output: inOutFiles/outputTest
• softsusy-nmssm.x: example NMSSM test program - loops over tan beta. Main program: src/main-nmssm.cpp. Output: inOutFiles/outputTest-nmssm
• rpvsoftsusy.x: example C++ test program - calculates spectrum of SPS1a mSUGRA point with varying lambda’_{331}(M_GUT). Main program: src/rpvmain.cpp. Output inOutFiles/rpvOutputTest
• rpvneut.x: example neutrino mass calculating R-parity violating test program. Main program src/rpvNeut.cpp. Output inOutFiles/neutOutputTest
• softpoint.x: command-line interface. GMSB, AMSB, mSUGRA and general boundary conditions possible, icluding SLHA. Main program: src/softpoint.cpp. See INSTALL.md for examples of reading in SLHA files and producing output.

Input and information files

• README.md contains these instructions
• inOutFiles/lesHouchesInput is an alternative input file in the SUSY Les Houches Accord (SLHA) format
• inOutFiles/nmssmSLHAnoZ3Input is an SLHA2 NMSSM input file without assuming Z3 symmetry
• inOutFiles/nmssmSLHAZ3Input is an SLHA NMSSM input file with the Z3 assumption
• inOutFiles/slha2Input is an alternative input file in the SUSY Les Houches Accord 2 format for SPS1a’
• inOutFiles/rpvHouchesInput is an alternative input file in the SUSY Les Houches Accord format for R-parity violation

Files included in this distribution

Source files are to be found in the src/ subdirectory. The inOutFiles/ directory contains input and output files. doc/ contains the manuals (see above).

Comparisons with other SUSY spectrum generators

There are detailed comparisons between SOFTSUSY and other publicly available programs in

• Uncertainties in the Lightest CP Even Higgs Boson Mass Prediction in the Minimal Supersymmetric Standard Model: Fixed Order Versus Effective Field Theory Prediction, B.C. Allanach and A. Voigt, Eur.Phys.J. C78 (2018) no.7, arxiv:1804.09410
• The Calculation of Sparticle and Higgs Decays in the Minimal and Next-to-Minimal Supersymmetric Standard Models: SOFTSUSY4.0, B.C. Allanach and T. Cridge, Comput. Phys. Comm. 220 (2017) 417, arxiv:1703.09717
• Precise Determination of the Neutral Higgs Boson Masses in the MSSM, B.C. Allanach, A. Djouadi, J.L. Kneur, W. Porod, P. Slavich, JHEP 0409 (2004) 044, hep-ph/0406166
• Theoretical uncertainties in sparticle mass predictions from computational tools, B.C. Allanach, S. Kraml, W. Porod, JHEP 03 (2003) 045, hep-ph/0302102

and comparisons with NMSSM generators in

• B.C. Allanach and T. Cridge, Comput. Phys. Comm. 220 (2017) 417, arxiv:1703.09717
• Higgs mass predictions of public NMSSM spectrum generators, Staub et al, Comp. Phys. Comm. 202 (2016) 113, arXiv:1507.05093
• Improved predictions for intermediate and heavy Supersymmetry in the MSSM and beyond Staub and Porod, Eur. Phys. J. C (2017) 77, arXiv:1703.03267

Licence

SOFTSUSY Copyright (C) 2007 B.C. Allanach

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

See licenses